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while-loopjulia
Jeremy McNees
Jeremy McNees

Reputation: 787

Julia While Loop not Working as Expected

I'm having trouble understanding a problem I have with my Julia while loops. Here's a simple example:

i = 1
while i <10
    bb = 2
    i = i + 1
end

bb

bb not defined
while loading In[36], in expression starting on line 1

My question is how is bb not defined here? Is this a problem of scope? I don't think it is, because i is incremented to 10 at the end.

Upvotes: 0

Views: 2323

Answers (1)

Isaiah Norton
Isaiah Norton

Reputation: 4366

As mentioned in the Scope of Variables section of the Julia manual, while loops introduce unique scope blocks. So, in the given example, bb is local to the while loop. To make bb available outside the loop, declare it first:

julia> i = 1; bb = 10
10

julia> while i <10
           bb = 2
           i = i + 1
       end

julia> bb
2

Upvotes: 6

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